2 Gram Backcountry Shower!

I use the smart water sport cap on my 1 liter narrow mouth aquafina bottles and like it alot, even for the shower. No second cap needed.

"How do you deal with "the funk" on week long trips?"

I don't. i embrace it
;)

kidding aside, i have a (1 gram??) solution, but it doesn't include the light milk tub. I have a shower attachment for my gravity filter. Works great unless there's nothing to hang the filter on, then it's time for hiking pole creative engineering. It does not always work out well.

I smell just fine after a week!

I just use mud or sand to clean up, and do it daily. You might be surprised how well it works. I don't carry soap anymore.

I bought a platypus shower attachmentback in 2008. I cut the tubing short (~4")and added a platypus quick disconnect to it, my bite valve and my platy resevoir. Just hang it from a tree when I want to use it by some cord and swap the bite valve for the shower attachment. You can take a decent shower with a 2L bag. Not as light as 2 grams, but still fractional ounces.

I have the MSR Dromedary 4 and 6 litre bags and bought the shower fitting, though I mainly use the suds up, rinse down strip wash with flannel method, after using wet wipes.

You could easily sand down the shower cap lid and cut the weight in half. It amazes me how these people have a total disreguard for pack weight, go light its better.